Magnetism and magnetic fluctuations in La1 - xSrxCuO4 for x = 0 (2D antiferromagnet), 0.04 (3D spin glass) and x = 0.15 (superconductor)

R. J. Birgeneau, A. Aharony, N. R. Belk, F. C. Chou, Y. Endoh, M. Greven, S. Hosoya, M. A. Kastner, C. H. Lee, Y. S. Lee, G. Shirane, S. Wakimoto, B. O. Wells, K. Yamada

Research output: Contribution to journalArticlepeer-review

Abstract

We review recent studies of the static and dynamic magnetic fluctuations in La2 - xSrxCuO4. In La2CuO4(TN = 325K) the instantaneous two-dimensional (2D) spin correlations have been studied over the temperature range 340K < T ≤ 820K. We find quantitative agreement for the correlation length over the complete temperature range with no adjustable parameters with predictions for the 2D quantum non-linear sigma model in the renormalized classical regime. We have carried out bulk magnetization measurements in La1.96Sr0.04CuO4 which has neither antiferromagnetic long range order nor superconductivity. All of the features that characterize a canonical spin glass transition have been seen: irreversibility, remnant magnetization and scaling behavior. Finally, neutron inelastic scattering experiments have been performed on homogeneous single crystals of La1.85Sr0.15CuO4 with Tc = 37.3K (at onset), higher than any previously studied single crystals. The temperature dependence of the low energy incommensurate peak intensity at (π(1 ± δ), π) and (π, π(1 ± δ)) exhibits a pronounced maximum near 3Tc. In contrast to the results reported on lower Tc crystals, the intensity for energies below 3.5 meV dramatically decreases as the temperature decreases below Tc, vanishing into the background below ~ 15K. The behavior is consistent with predictions based on a dx2 - y2 superconducting order parameter.

Original languageEnglish
Pages (from-to)1913-1919
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume56
Issue number12
DOIs
StatePublished - Dec 1995

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